有理数正负数混合运算 答案
1.（47*397.5+4.7*6025）-2³
=（4.7*3975+4.7*6025）-8
=4.7*（3975+6025）-8
=47000-8
=46992
2.（-2）²-{-（-5²）}
=4-25
=-21
3.[-7/2]+5/6+[-0.5]+4/5+19/6
=5/6+19/6-7/2-0.5+5/4
=1.25
4 1.125+[-17/5]+[-1/8]+[-0.6]= -3
5.[-|98|+76+(-87)]*23+23*[56+(-75)-(7)]-(8+4+3)
=-3450
=（4.7*3975+4.7*6025）-8
=4.7*（3975+6025）-8
=47000-8
=46992
2.（-2）²-{-（-5²）}
=4-25
=-21
3.[-7/2]+5/6+[-0.5]+4/5+19/6
=5/6+19/6-7/2-0.5+5/4
=1.25
4 1.125+[-17/5]+[-1/8]+[-0.6]= -3
5.[-|98|+76+(-87)]*23+23*[56+(-75)-(7)]-(8+4+3)
=-3450
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